Just a suggestion for your blind student. This is a lesson that I did with
my class, only I had to blindfold them to do it, so I am sure it would be
adaptable for your student.

It was a lesson on textures. The students were blindfolded, and I then put
objects with very different textures into their hands: (for example: a
piece of sandpaper, a corncob, a sponge, a piece of velvet, a ball of yarn,
a brick, an onion, an oak leaf, a pine cone, a piece of tree bark etc....)
The exercise was to feel with their hands what the texture felt like and
try to describe it. Then, still with their eyes closed try to draw the
texture as they felt it on a piece of paper with a crayon or pencil....The
exercise continued to then take the blindfold off and draw the texture of
the object by observing it. The idea was not to draw the object itself but
render a sample of the texture.
These samples were then cut out and a collage was made of the various
textures. The whole idea was to make the students more aware of different
kinds of surfaces when drawing etc. because they tend to "color in"
everything they do in the same manner whether it be a tree trunk or the
surface of water or whatever.